Well pump jack



June 22,1926. 1,589,376

M. L. DOBSON WELL PUMP- JACK Filed March 9, 1926 2 Sheets-Sheet 1 i ks Inventor M. I. 170660 Attbrney June 22 1926.

M. L. DOBSON WELL PUMP JACK Filed March 9, 1926 2 Sheets-Sheet 2 I 7111671207 l/k. L. 30680 Bygw M Attorney Patented June 22, 1926.

MARION LEE IDOBSON, OF KEVIN, MONTANA.

WELL PUMP JACK.

Application filed March 9, 1926. Serial No. 93 ,477.

The present invention relates to 'awell pump jack, and has for its principal object to provide a very simple and highly efiicient structure which is fairly reliable in operation. I 7

Another very important object of the invention is to provide a pump jack of this nature which affords a long stroke for the pull line, said stroke being adjustable in various different ways.

Another very important object of the invention is the provision of a pump jack of this nature which is strong and durable, one which is not likely to easily become out of order, and is otherwise well adapted to the purpose for which it is designed.

Vith the above and numerous other objects in view as will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawing Figure 1 is a side elevation of the jack embodying the features of my invention,

Fig. 2 is a top plan view thereof,

Fig. 3 is a detail view of the toggle operating mechanism,

Fig. 1 is an enlarged detail section taken substantially on the line H of Fig. 1, and

Fig. 5 is a detail elevation of the gudgeon plate.

Referring to the drawing in detail, it will be seen that the numeral 5 designates a pair of parallel spaced co-extensive sills from which rise bars 6. A pair of bars 6 rise from each sill 5 and are slanted toward each other to converge at their upper ends for receiving a connecting block 7 in which is journaled a pin 8 piercing the bracket 9 intermediately disposed on a walking beam.

The walking beam 10 is suitably'braced as at 11. Counterbalancing weights 12 are adjustably mounted on one portion of the walking beam.

A rack 13 is adjustably mounted on the other portion of the walking beam by means of bolt and nut 14 and bridge plate 15. An arcuate cross head 16 is mounted on the end of the walking beam 10 adjacent the rack 13. A link 17 is pivoted at 18 to the intermediate portion of the arcuate head 16. A sucker rod 19 is engaged with the link 17 as at 20 and engages the arcuate surface of the cross head 16. The curvature of the cross head is concentric with the is indicated to advantage in Fig. 1. This plate 22 is provided with a dependin-gcas ing portion 25 having a' udgeon receiving 2 pocket or seat 26. A togg e operating mechanism has its crank member 27 provided with a gudgeon 2'8 receivable in the seat 26. A pitm-an member 29 is pivoted intermediate its ends as at 30 to the other end of the crank member 27 The upper end of the pitman member 29 is provided with an arcuate rack 31, meshable with the rack 13, and braced by rods 32 and 33. The lower por tion of the pitman member 29 is provided with a plurality of notches 34. A clevis 35 is engaged with the pin 30 and with the pull line 36. This clevis 35 may be used with a pin 37 receivable in any of the notches 34, so that the stroke of the pull line may be varied.

From the above detailed description it will be seen that when the pull line 36 moves to the right, the toggle mechanism including the crank 27 and pitman 29 will lengthen out, thereby rocking the walking beam 10 to lift the head 16 and the sucker rods 19. As the pull line 36 moves to the left, the weight of the sucker rods and the other pumping mechanism return the walking beam, so that it rocks in a counter-clockwise direction thereby braking the mechanism so asto move the pivot pins 30 to the left of Fig. 1. v

The present embodiment of the invention has been disclosed in detail, since in actual practice, it attains the features of advantage enumerated as desirable in the statement of the invention and the above description. It will be quite apparent that numerous different adjustments may be made for varying the length of the stroke of the pull line as may be desirable. These adjustments may be made either by moving the rack 13 longitudinally of the walking beam 10', or by shifting the location of the clevis 35 as heretofore indicated, or by shifting the location of the plate 22 on the sills 5. I

It is thought that the construction, operation, and advantages of this invention will now be clearly understood without a more detailed description thereof. The present embodiment of the invention is subjected to numerous changes in the details of construction, and in the combination and arrangement of parts without departing from the spirit or scope of the invention as hereinafter claimed.

Having thus described my invention, what I claim as new is 1. A pump jack of the class described including a rockably mounted walking beam, a rack on the walking beam, a pitman having an arcuate rack at one end engageable with the first rack, a. crank pivotally engaged with the pitman, a gudgeon on the end of the crank, a gudgeon receiving member for the gudgeon, and means for attaching a pull line to the pitman.

2. A pump jack of the class described including a rockably mounted walking beam, a rack on the Walking beam, a member having an arcuate rack at one end meshable with the first rack, a second member, means for pivoting the second member, means for pivoting the second member to the first member, and means for engaging one of the members with a pull line.

3. In a pump jack of the class described, a pair of sills, members rising from the sills, a walking beam rockably mounted between the members, a rack on the walking beam, a gudgeon receiving plate having prongs embeddable in the sills, a crank having a gudgeon receiveable in the plate, a pitman pivotally engaged with the crank and having an arcuate rack engageable with the first rack, and'means for rocking the pitman. V i

In testimony whereof I aflix my signature.

MARION LEE DOBSON. 

